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Abstract

It is known that circuit boards can be fabricated by adhering insulated wires to a substrate. Such boards are made by laying the wires down on an adhesive and drilling holes where connections to the wires are desired. Improved connections to the wires in such boards can be made by utilizing wire which has two layers of insulation, namely, an inner layer and an outer layer. The inner layer which is next to the copper wire is made of a soluble material, whereas the outer layer is made of an insoluble material. After the holes in the board are drilled, they are cleaned with a material which dissolves the inner layer of insulation around the ends of the wire. In this way when the holes are plated, a better electrical connection is made to the wire.

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United States

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English (United States)

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Differential Solubility Wire

It is known that circuit boards can be fabricated by adhering insulated wires to a
substrate. Such boards are made by laying the wires down on an adhesive and
drilling holes where connections to the wires are desired. Improved connections
to the wires in such boards can be made by utilizing wire which has two layers of
insulation, namely, an inner layer and an outer layer. The inner layer which is
next to the copper wire is made of a soluble material, whereas the outer layer is
made of an insoluble material. After the holes in the board are drilled, they are
cleaned with a material which dissolves the inner layer of insulation around the
ends of the wire. In this way when the holes are plated, a better electrical
connection is made to the wire.